RefCounted types should not have public destructors, base/ edition

base/files/file_path_watcher_kqueue.cc

Index: base/files/file_path_watcher_kqueue.cc
diff --git a/base/files/file_path_watcher_kqueue.cc b/base/files/file_path_watcher_kqueue.cc
index d4ddb7dae62f7817a60e5faab621043fa8c06973..fc516fb6a40b2bd61e2b88a7404e9c1636635e25 100644
--- a/base/files/file_path_watcher_kqueue.cc
+++ b/base/files/file_path_watcher_kqueue.cc
@@ -54,7 +54,6 @@ class FilePathWatcherImpl : public FilePathWatcher::PlatformDelegate,
                             public MessageLoop::DestructionObserver {
  public:
   FilePathWatcherImpl() : kqueue_(-1) {}
-  virtual ~FilePathWatcherImpl() {}
 
   // MessageLoopForIO::Watcher overrides.
   virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
@@ -68,6 +67,9 @@ class FilePathWatcherImpl : public FilePathWatcher::PlatformDelegate,
                      FilePathWatcher::Delegate* delegate) OVERRIDE;
   virtual void Cancel() OVERRIDE;
 
+ protected:
+  virtual ~FilePathWatcherImpl() {}
+
  private:
   class EventData {
    public: